Pressure relief valve and an electrolytic capacitor therewith

Abstract

A pressure relief valve and an electrolytic capacitor, including: a valve seat, wherein an exhaust passage is formed, an installation groove arranged on the top which communicates with the passage; a blocking cover, movably arranged on the groove between an open and a closed position for opening and closing the passage, a sealing ring arranged between the bottom of the cover and the groove, wherein at least part of the bottom wall forms a guide surface, which extends from the center of the cover radially outward and upward obliquely to the radial edge. The valve can be suitable for the installation of the capacitor to reduce the internal gas pressure therein, maintain the internal gas pressure within a safe range, and at the same time reduce the bulging of the bottom of the capacitor, so that the core package and the bottom are closely attached to achieve effective heat dissipation.

What is claimed is: 
     
       1. A pressure relief valve, comprising:
 a valve seat, wherein an exhaust passage is formed on the valve seat, an installation groove is arranged on the top of the valve seat, and the installation groove is in communication with the exhaust passage; 
 a blocking cover, wherein the blocking cover is movably arranged on the installation groove between an open position for opening the exhaust passage and a closed position for closing the exhaust passage, a sealing ring is arranged between the bottom of the blocking cover and the installation groove, wherein at least a part of the bottom wall of the blocking cover forms a guide surface, and the guide surface extends from the center of the blocking cover radially outward and upward obliquely, the guide surface extends to the radial edge of the blocking cover; 
 wherein the bottom wall of the blocking cover tilts gradually from one end to the other end in the diameter direction of the blocking cover to form the guide surface. 
 
     
     
       2. The pressure relief valve according to  claim 1 , wherein the bottom wall of the blocking cover tilts gradually from the center of the blocking cover to the circumferential edge to form the guide surface. 
     
     
       3. The pressure relief valve according to  claim 2 , wherein the guide surface is a conical surface. 
     
     
       4. The pressure relief valve according to  claim 1 , wherein the inclination angle of the guide surface ranges from 5 degrees to 15 degrees. 
     
     
       5. The pressure relief valve according to  claim 1 , wherein it also comprises a resetting member, the resetting member is arranged on the valve seat and is used to drive the blocking cover to the closed position when the blocking cover is in the open position. 
     
     
       6. The pressure relief valve according to  claim 5 , wherein the resetting member comprises an elastic member. 
     
     
       7. The pressure relief valve according to  claim 6 , wherein the upper end of the elastic member is connected with the blocking cover and the lower end is fixed relative to the valve seat, and the elastic member is in a constant stretched state. 
     
     
       8. The pressure relief valve according to  claim 7 , wherein a first guide rod is arranged between the upper end of the elastic member and the blocking cover, the exhaust passage comprises a first guide section, and the first guide rod is placed in the first guide section and can move up and down. 
     
     
       9. The pressure relief valve according to  claim 7 , wherein the pressure relief valve further comprises a first base, the first base is arranged at the bottom of the valve seat, and the first base is provided with air hole, the lower end of the elastic member is fixedly connected with the first base. 
     
     
       10. The pressure relief valve according to  claim 6 , wherein the exhaust passage comprises an installation section and a second guide section located above the installation section;
 the pressure relief valve further comprises an installation member, the installation member comprises a second guide rod and a stop part, the stop part is arranged at the bottom end of the second guide rod, the stop part is accommodated in the installation section, the second guide rod is located in the second guide section, two ends of the elastic member are respectively stopped between the top wall of the installation section and the stop part, and the elastic member is in a constant compression state. 
 
     
     
       11. An electrolytic capacitor, comprising the pressure relief valve according to  claim 1 . 
     
     
       12. The electrolytic capacitor according to  claim 11 , wherein the pressure relief valve is placed on the shell and/or the cover plate of the electrolytic capacitor. 
     
     
       13. A pressure relief valve, comprising:
 a valve seat, wherein an exhaust passage is formed on the valve seat, an installation groove is arranged on the top of the valve seat, and the installation groove is in communication with the exhaust passage; 
 a blocking cover, wherein the blocking cover is movably arranged on the installation groove between an open position for opening the exhaust passage and a closed position for closing the exhaust passage, a sealing ring is arranged between the bottom of the blocking cover and the installation groove, wherein at least a part of the bottom wall of the blocking cover forms a guide surface, and the guide surface extends from the center of the blocking cover radially outward and upward obliquely, the guide surface extends to the radial edge of the blocking cover; 
 wherein it also comprises a resetting member, the resetting member is arranged on the valve seat and is used to drive the blocking cover to the closed position when the blocking cover is in the open position; 
 wherein the resetting member comprises an elastic member; 
 wherein the upper end of the elastic member is connected with the blocking cover and the lower end is fixed relative to the valve seat, and the elastic member is in a constant stretched state. 
 
     
     
       14. The pressure relief valve according to  claim 13 , wherein a first guide rod is arranged between the upper end of the elastic member and the blocking cover, the exhaust passage comprises a first guide section, and the first guide rod is placed in the first guide section and can move up and down. 
     
     
       15. The pressure relief valve according to  claim 13 , wherein the pressure relief valve further comprises a first base, the first base is arranged at the bottom of the valve seat, and the first base is provided with air hole, the lower end of the elastic member is fixedly connected with the first base. 
     
     
       16. A pressure relief valve, comprising:
 a valve seat, wherein an exhaust passage is formed on the valve seat, an installation groove is arranged on the top of the valve seat, and the installation groove is in communication with the exhaust passage; 
 a blocking cover, wherein the blocking cover is movably arranged on the installation groove between an open position for opening the exhaust passage and a closed position for closing the exhaust passage, a sealing ring is arranged between the bottom of the blocking cover and the installation groove, wherein at least a part of the bottom wall of the blocking cover forms a guide surface, and the guide surface extends from the center of the blocking cover radially outward and upward obliquely, the guide surface extends to the radial edge of the blocking cover; 
 wherein it also comprises a resetting member, the resetting member is arranged on the valve seat and is used to drive the blocking cover to the closed position when the blocking cover is in the open position; 
 wherein the resetting member comprises an elastic member; 
 wherein the exhaust passage comprises an installation section and a second guide section located above the installation section; 
 the pressure relief valve further comprises an installation member, the installation member comprises a second guide rod and a stop part, the stop part is arranged at the bottom end of the second guide rod, the stop part is accommodated in the installation section, the second guide rod is located in the second guide section, two ends of the elastic member are respectively stopped between the top wall of the installation section and the stop part, and the elastic member is in a constant compression state.